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Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

Physical Review B 2020年第12期102卷 125145-125145页

作者： T. S. Suraj Ganesh Ji Omar Hariom Jani M. M. Juvaid Sonu Hooda Anindita Chaudhuri Andrivo Rusydi K. Sethupathi Thirumalai Venkatesan Ariando Ariando M. S. Ramachandra Rao Department of Physics Nano Functional Materials Technology Center Material Science Research Center Indian Institute of Technology Madras Chennai 600036 India Low Temperature Physics Lab Department of Physics Indian Institute of Technology Madras Chennai 600036 India Department of Physics National University of Singapore Singapore 117542 Singapore NUSNNI-NanoCore National University of Singapore Singapore 117411 Singapore National University of Singapore Graduate School for Integrative Sciences and Engineering (NGS) University Hall 21 Lower Kent Ridge Road Singapore 119077 Singapore Singapore Synchrotron Light Source National University of Singapore 5 Research Link Singapore 117603 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

Tailoring spin-orbit interactions and Coulomb repulsion are the key features to observe exotic physical phenomena such as magnetic anisotropy and topological spin texture at oxide interfaces. Our study proposes a platform for engineering magnetism and spin-orbit coupling at the LaMnO3/SrIrO3 (3d−5d) oxide interface by tuning the LaMnO3 growth conditions, which controls the lattice displacement and spin-correlated interfacial coupling through charge transfer. We report a tunable and enhanced interface-induced Rashba spin-orbit coupling where the spin relaxation mechanism varies with magnetic behavior of the underlying LaMnO3 layer. The x-ray spectroscopy measurements reveal the quantitative valence states of Mn and their impact on charge transfer. Our angle-dependent magnetoresistance measurements also reflects the signature of magnetic proximity effect in SrIrO3 and can be tuned with the magnetic nature of LaMnO3 in a LaMnO3/SrIrO3 bilayer. Our work demonstrates a route to engineer the interface-induced Rashba spin-orbit coupling and magnetic proximity effect at the 3d−5d oxide interface for spintronics applications.

关键词： Magnetoresistance Rashba coupling Spin relaxation Spin-orbit coupling Interfaces Strongly correlated systems

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Applications of the Poincaré–Hopf Theorem: Epidemic Models and Lotka–Volterra Systems

arXiv

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arXiv 2019年

作者： Ye, Mengbin Liu, Ji Anderson, Brian D.O. Cao, Ming Optus–Curtin Centre of Excellence in Artificial Intelligence Curtin University Perth Australia Faculty of Science and Engineering ENTEG University of Groningen Groningen9747 AG Netherlands Research School of Electrical Energy and Material Engineering Australian National University Canberra Australia Hangzhou Dianzi University China Data61-CSIRO Canberra Australia Department of Electrical and Computer Engineering Stony Brook University United States

This paper focuses on properties of equilibria and their associated regions of attraction for continuous-time nonlinear dynamical systems. The classical Poincaré–Hopf Theorem is used to derive a general result providing a sufficient condition for the existence of a unique equilibrium for the system. The condition involves the Jacobian of the system at possible equilibria, and ensures the system is in fact locally exponentially stable. We show how to apply this result to the deterministic susceptible-infected-susceptible (SIS) networked model, and a nonlinear Lotka–Volterra system. We use the result further to extend the SIS model via the introduction of a broad class of decentralised feedback controllers, which significantly change the system dynamics, rendering existing Lyapunov-based approaches to analysis of the system invalid. Using the Poincaré–Hopf based approach, we identify a necessary and sufficient condition under which the controlled SIS system has a unique nonzero equilibrium (a diseased steady-state), and we show using monotone systems theory that this nonzero equilibrium is attractive for all nonzero initial conditions. A counterpart sufficient condition for the existence of a unique equilibrium for a nonlinear discrete-time dynamical system is also presented. Copyright © 2019, The Authors. All rights reserved.

关键词： Continuous time systems

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Extended Drude Model for Intraband-Transition-Induced Optical Nonlinearity

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Physical Review Applied 2019年第6期11卷 064062-064062页

作者： Heng Wang Kang Du Chuhao Jiang Zhiqiang Yang Lixia Ren Wending Zhang Soo Jin Chua Ting Mei MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Science Northwestern Polytechnical University Xi’an 710072 China Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117583 LEES Program Singapore-MIT Alliance for Research & Technology (SMART) 1 CREATE Way #10-01 CREATE Tower Singapore 138602

No existing model has completely explained the physics of the optical nonlinearity for epsilon-near-zero materials, which have recently emerged as candidates for design and fabrication of active nanophotonic devices. We propose to extend the Drude model by adopting a weighted electron effective mass, which takes into account the electron distribution in the nonparabolic conduction band. The extended Drude model is able to interpret the cause of the nonlinearity and provide a functional relationship between the refractive index and wavelength. Both the band nonparabolicity and the temperature-dependent mobility are responsible for the intraband-transition-induced optical nonlinearity. The spectrally resolved nonlinear refractive index and nonlinear susceptibilities are obtained from this model. The results can be applied to other transparent conducting oxides and will help in the design and modeling of spectral responses of nonlinear plasmonic devices.

关键词： Electronic transitions Nonlinear optical susceptibility Optoelectronics Plasmonics Ultrafast optics Thin films Free-electron model Ultrafast pump-probe spectroscopy

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Optical cryptography with biometrics and optical scanning holography

Optical cryptography with biometrics and optical scanning ho...

引用

Digital Holography and Three-Dimensional Imaging, DH 2018

作者： Yan, Aimin Hu, Zhijuan Tsang, Peter Wai Ming Poon, Ting-Chung Key Laboratory of Optoelectronic Material and Device College of Mathematics and Science Shanghai Normal University Shanghai200234 China Department of Electronic Engineering City University of Hong Kong Hong Kong Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA24061 United States

In this invited talk, we will review optical cryptography with biometrics for multi-depth objects using optical scanning holography (OSH). We also focus on the discussion of key distribution. © 2018 The Author(s).

ISBN: (纸本)9781943580446

关键词： Holography

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A generalized model of TiOx-based memristive devices and its application for image processing

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Chinese Physics B 2017年第9期26卷 70-81页

作者：张江伟汤振森许诺王耀孙红辉王之元方粮 State Key Laboratory of High Performance Computing National University of Defense Technology School of Computer National University of Defense Technology Department of Electrical and Computer Engineering University of Pittsburgh Department of Material Science and Engineering College of EngineeringSeoul National University School of Computer National University of Defense Technology

Memristive technology has been widely explored, due to its distinctive properties, such as nonvolatility, high density,versatility, and CMOS compatibility. For memristive devices, a general compact model is highly favorable for the realization of its circuits and applications. In this paper, we propose a novel memristive model of TiOx-based devices, which considers the negative differential resistance（NDR） behavior. This model is physics-oriented and passes Linn＇s criteria. It not only exhibits sufficient accuracy（IV characteristics within 1.5% RMS）, lower latency（below half the VTEAM model）,and preferable generality compared to previous models, but also yields more precise predictions of long-term potentiation/depression（LTP/LTD）. Finally, novel methods based on memristive models are proposed for gray sketching and edge detection applications. These methods avoid complex nonlinear functions required by their original counterparts. When the proposed model is utilized in these methods, they achieve increased contrast ratio and accuracy（for gray sketching and edge detection, respectively） compared to the Simmons model. Our results suggest a memristor-based network is a promising candidate to tackle the existing inefficiencies in traditional image processing methods.

关键词： memristor modeling memristor-based network gray sketching edge detection

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Optical data transmission at 44Tb/s and 10 bits/s/Hz spectral density over standard fibre with a single micro-comb source chip

TechRxiv

引用

TechRxiv 2020年

作者： Moss, David J. Morandotti, Roberto Mitchell, Arnan Xu, Xingyuan Wu, Jiayang Tanmengxi tan, Mengxi Corcoran, Bill Boes, Andreas Nguyen, Thach G. Chu, Sai Tak Little, Brent E. Department of Electrical and Computer System Engineering Monash University ClaytonVIC3168 Australia Centre for Micro-Photonics Swinburne University of Technology HawthornVIC3122 Australia School of Engineering RMIT University MelbourneVIC3001 Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Xi’an Institute of Optics and Precision Mechanics Precision Mechanics of CAS Xi’an China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada

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Optical data transmission at 44Tb/s and 10 bits/s/Hz over the c-band with standard fibre and a single micro-comb source

arXiv

引用

arXiv 2020年

作者： Corcoran, Bill Tan, Mengxi Xu, Xingyuan Boes, Andreas Wu, Jiayang Nguyen, Thach G. Chu, Sai T. Little, Brent E. Morandotti, Roberto Mitchell, Arnan Moss, David J. Department of Electrical and Computer System Engineering Monash University ClaytonVIC3168 Australia Optical Sciences Centre Swinburne University of Technology HawthornVIC3122 Australia School of Engineering RMIT University MelbourneVIC3001 Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of CAS Xi'an China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada

Micro-combs [1-4] - optical frequency combs generated by integrated micro-cavity resonators - offer the full potential of their bulk counterparts [5,6], but in an integrated footprint. The discovery of temporal soliton states (DKS - dissipative Kerr solitons) [4,7-11] as a means of mode-locking microcombs has enabled breakthroughs in many fields including spectroscopy [12,13], microwave photonics [14], frequency synthesis [15], optical ranging [16,17], quantum sources [18,19], metrology [20,21] and more. One of their most promising applications has been optical fibre communications where they have enabled massively parallel ultrahigh capacity multiplexed data transmission [22,23]. Here, by using a new and powerful class of micro-comb called "soliton crystals" [11], we achieve unprecedented data transmission over standard optical fibre using a single integrated chip source. We demonstrate a line rate of 44.2 Terabits per second (Tb/s) using the telecommunications C-band at 1550nm with a spectral efficiency - a critically important performance metric - of 10.4 bits/s/Hz. Soliton crystals exhibit robust and stable generation and operation as well as a high intrinsic efficiency that, together with a low soliton micro-comb spacing of 48.9 GHz enable the use of a very high coherent data modulation format of 64 QAM (quadrature amplitude modulated). We demonstrate error free transmission over 75 km of standard optical fibre in the laboratory as well as in a field trial over an installed metropolitan optical fibre network. These experiments were greatly aided by the ability of the soliton crystals to operate without stabilization or feedback control. This work demonstrates the capability of optical soliton crystal micro-combs to perform in demanding and practical optical communications networks. Copyright © 2020, The Authors. All rights reserved.

关键词： Solitons

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Erratum “15.9% organic tandem solar cell with extended near-infrared absorption” [Appl. Phys. Lett. 116, 153501 (2020)]

引用

Applied Physics Letters 2021年第21期118卷

作者： Xinjing Huang Bangjin Sun Yongxi Li Chao Jiang Dejiu Fan Jian Fan Stephen R. Forrest 1Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA 2Institute of Functional Nano and Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University Suzhou Jiangsu 215123 China 3Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan 48109 USA 4Department of Physics and Material Science and Engineering University of Michigan Ann Arbor Michigan 48109 USA

The authors regret that a related article was not cited in the original published article.1 In the first paragraph, the sentence “We introduce a surface treatme

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Tunable and enhanced rashba spin-orbit coupling in iridate-manganite heterostructures

arXiv

引用

arXiv 2020年

作者： Suraj, T.S. Omar, Ganesh Ji Jani, Hariom Juvaid, Muhammad Mangattuchali Hooda, Sonu Chaudhuri, Anindita Rusydi, Andrivo Sethupathi, Kanikrishnan Venkatesan, Thirumalai Ariando, Ariando Rao, Mamidanna Sri Ramachandra Department of Physics Nano Functional Materials Technology Center Material Science Research Center IIT Madras 600036 India Low Temperature Physics Lab Department of Physics Indian institute of Madras Chennai600036 India Department of Physics National University of Singapore Singapore117542 Singapore NUSNNI-NanoCore National University of Singapore Singapore117411 Singapore Synchrotron Light Source National University of Singapore 5 Research Link Singapore117603 Singapore University Hall 21 Lower Kent Ridge Road Singapore119077 Department of Materials Science and Engineering National University of Singapore Singapore117575 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore117576 Singapore

Tailoring spin-orbit interactions and Coulomb repulsion are the key features to observe exotic physical phenomena such as magnetic anisotropy and topological spin texture at oxide interfaces. Our study proposes a novel platform for engineering the magnetism and spin-orbit coupling at LaMnO3/SrIrO3 (3d-5d oxide) interfaces by tuning the LaMnO3 growth conditions which controls the lattice displacement and spin-correlated interfacial coupling through charge transfer. We report on a tunable and enhanced interface-induced Rashba spin-orbit coupling and Elliot-Yafet spin relaxation mechanism in LaMnO3/SrIrO3 bilayer with change in the underlying magnetic order of LaMnO3. We also observed enhanced spin-orbit coupling strength in LaMnO3/SrIrO3 compared to previously reported SrIrO3 layers. The X-Ray spectroscopy measurement reveals the quantitative valence of Mn and their impact on charge transfer. Further, we performed angle-dependent magnetoresistance measurements, which show signatures of magnetic proximity effect in SrIrO3 while reflecting the magnetic order of LaMnO3. Our work thus demonstrates a new route to engineer the interface induced Rashba spin-orbit coupling and magnetic proximity effect in 3d-5d oxide interfaces which makes SrIrO3 an ideal candidate for spintronics applications. Copyright © 2020, The Authors. All rights reserved.

关键词： Charge transfer

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Plasmonic antenna coupling to hyperbolic phonon-polaritons for sensitive and fast mid-infrared photodetection with graphene

arXiv

引用

arXiv 2020年

作者： Castilla, Sebastián Vangelidis, Ioannis Pusapati, Varun-Varma Goldstein, Jordan Autore, Marta Slipchenko, Tetiana Rajendran, Khannan Kim, Seyoon Watanabe, Kenji Taniguchi, Takashi Martín-Moreno, Luis Englund, Dirk Tielrooij, Klaas-Jan Hillenbrand, Rainer Lidorikis, Elefterios Koppens, Frank H.L. ICFO - Institut de Ciències Fotòniques Barcelona Institute of Science and Technology CastelldefelsBarcelona08860 Spain Department of Materials Science and Engineering University of Ioannina Ioannina45110 Greece Department of Electrical Engineering and Computer Sciences Massachusetts Institute of Technology CambridgeMA02139 United States CIC nanoGUNE E-20018 Donostia-San Sebastián Spain Instituto de Ciencia de Materiales de Aragón Departamento de Física de la Materia Condensada CSIC-Universidad de Zaragoza Zaragoza50009 Spain Advanced Materials Laboratory National Institute for Material Science Tsukuba305-0044 Japan Barcelona Institute of Science and Technology Campus UAB Bellaterra Barcelona08193 Spain IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Institute of Materials Science and Computing Ioannina45110 Greece ICREA - Institució Catalana de Recerca i Estudis Avançats Barcelona08010 Spain

Integrating and manipulating the nano-optoelectronic properties of Van der Waals heterostructures can enable unprecedented platforms for photodetection and sensing. The main challenge of infrared photodetectors is to funnel the light into a small nanoscale active area and efficiently convert it into an electrical signal. Here, we overcome all of those challenges in one device, by efficient coupling of a plasmonic antenna to hyperbolic phonon-polaritons in hexagonal-BN to highly concentrate mid-infrared light into a graphene pn-junction. We balance the interplay of the absorption, electrical and thermal conductivity of graphene via the device geometry. This novel approach yields remarkable device performance featuring room temperature high sensitivity (NEP of 82 pW/√Hz) and fast rise time of 17 nanoseconds (setup-limited), among others, hence achieving a combination currently not present in the state-of-the-art graphene and commercial mid-infrared detectors. We also develop a multiphysics model that shows excellent quantitative agreement with our experimental results and reveals the different contributions to our photoresponse, thus paving the way for further improvement of these types of photodetectors even beyond mid-infrared range. Copyright © 2020, The Authors. All rights reserved.

关键词： Graphene

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